Subrat,

When you don't have a virtual link connecting your area 3 with the backbone,
your area3 will not see any symmary lsa from the backbone containing networks
from area 0 and outside and as a result, you will not know any network in your
routing table which is in the backbone or further on.

Kind regards, Katrien

Mohanty wrote:

> Hi Lord!
> I understood u r point. My doubt is a basic one. What is the philosophy
> behind the concept of VLink and backbone connectivity(I believe they are
> pretty inter related). Our main goal is to forward the data traffic. So if I
> don't have a VLink, and don't connect Area3 to BB, still I will be able to
> forward the data traffic. When u form a VLink between R1 and R2 say, the
> basic reqiurement is u have a route in R1 to R2 and vice versa. U already
> have a connectivity between them. If u want to forward some traffic from R1
> to some destination, thru R2, then u can still do it without having a Vlink.
> Pl. go thru Sina's reply and my questions to him also, so that u can get
> more about my doubt.
> Regards Subbu
>
> -----Original Message-----
> From: Mailing List [mailto:OSPFdiscuss.microsoft.com]On Behalf Of
> Sivaguru Sankaridurg
> Sent: Tuesday, July 03, 2001 11:48 PM
> To: OSPFdiscuss.microsoft.com
> Subject: Re: Doubt in Virtual Link
>
> Hi subbu,
>
> Vlink is very easy. Dont think abt it is being
> complicated and all that.
> If u have an area border router that cannot directly
> connect to the Backbone as with Area 3 in the figure.,
> then u will need to configure a Vlink between this ABR
> and another ABR that is connected to the backbone.
>
> That is all.
> If this is done, OSPF routing protocol will treat the
> area (ARea3 in this case) as though it is directly
> connected to the backbone.
>
> Bye
> Siva
>
> --- Subrat Mohanty <subratmFUTURE.FUTSOFT.COM> wrote:
> > I have a basic doubt in Virtual Link. I am still not
> > clear about the use or
> > benifit of the VLink.
> >
> > Pl. Check RFC-2328 Fig-6. Sec-3.4. See the last line
> > which states
> >
> > "Note that a failure of the line between Routers RT6
> > and RT10 will cause the
> > backbone to become disconnected. Configuring a
> > virtual link between Routers
> > RT7 and RT10 will give the backbone more
> > connectivity and more resistance to
> > such failures. "
> >
> > Anyway RT7 and RT10 are connected thru network-6 and
> > all the routers are
> > having this info so that when the link fails between
> > RT6-RT10 fails they can
> > still do the routing. What is the benifit of the
> > Vlink?
> >
> > Can u pl. give me a scenario where I will have an
> > advantage of a VLink?
> >
> > Regards Subrat
>
> =====
> ----------------------------------------------------------------------------
> ----------------------------------------------
> Sivaguru Sankaridurg
> Graduate Student
> Computer Science Department
> Univeristy of California, Santa Barbara
> www.cs.ucsb.edu/~srsiva
> srsivacs.ucsb.edu
>
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